Power-reduction Formula
Obtained by solving the second and third versions of the cosine double-angle formula.
| Sine | Cosine | Other |
|---|---|---|
and in general terms of powers of sin θ or cos θ the following is true, and can be deduced using De Moivre's formula, Euler's formula and binomial theorem.
| Cosine | Sine | |
|---|---|---|
Read more about this topic: List Of Trigonometric Identities
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